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Peer-reviewedCC BY 4.0The Astrophysical Journal Letters

Collisionless Shock Driven by a Supersonic Velocity Shear

  • Kazuki Kamiido1
  • Yutaka Ohira1
  1. 1The University of Tokyo
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Abstract

The long-term evolution of a relativistic collisionless velocity shear in an unmagnetized electron-positron plasma is investigated using a first-principle particle-in-cell simulation. The Alves instability converts the shear kinetic energy into thermal and magnetic field energy. The resulting pressures push the plasma, leading to the formation of collisionless shocks. The generated collisionless shocks would accelerate high energy particles, which is a possible solution to the injection problem of shear acceleration. In addition, the collisionless shocks generate a magnetic field turbulence that is required for the shear acceleration to work.

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Cite

BibTeXRIS
BibTeX
@article{kamiido2026collisionless,
  title = {{Collisionless Shock Driven by a Supersonic Velocity Shear}},
  author = {Kazuki Kamiido and Yutaka Ohira},
  journal = {The Astrophysical Journal Letters},
  year = {2026},
  month = oct,
  doi = {10.3847/2041-8213/aeaba2},
  url = {https://iopscience.iop.org/article/10.3847/2041-8213/aeaba2},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Collisionless Shock Driven by a Supersonic Velocity Shear
AU  - Kazuki Kamiido
AU  - Yutaka Ohira
PY  - 2026
DA  - 2026/10/07
JO  - The Astrophysical Journal Letters
DO  - 10.3847/2041-8213/aeaba2
UR  - https://iopscience.iop.org/article/10.3847/2041-8213/aeaba2
AB  - The long-term evolution of a relativistic collisionless velocity shear in an unmagnetized electron-positron plasma is investigated using a first-principle particle-in-cell simulation. The Alves instability converts the shear kinetic energy into thermal and magnetic field energy. The resulting pressures push the plasma, leading to the formation of collisionless shocks. The generated collisionless shocks would accelerate high energy particles, which is a possible solution to the injection problem of shear acceleration. In addition, the collisionless shocks generate a magnetic field turbulence that is required for the shear acceleration to work.
SN  - 2041-8205
SN  - 2041-8213
ER  -